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Old 09-15-2018, 11:06 PM   #1 (permalink)
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Figured I'd ask here, because you guys are not idiots

Well, not COMPLETE idiots, anyway

I was calibrating my new printer today (it's a reengineered older printer, so not new parts) and tripped the thermal runaway protection in Marlin, while trying to heat the hotend (V6 clone). I checked, and have 12v at the board when heating, and I have continuity (5.3 M ohms) across the heater cartridge, but it's definitely not heating. Thermistor is reporting the correct ambient temperature and the block isn't feeling warm, so I doubt it's a bad sensor.

Any ideas? It's all academic anyway, because I have a replacement arriving tomorrow, but I'd rather not toss good parts.
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Old 09-15-2018, 11:11 PM   #2 (permalink)
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Broken wire between the board and the heater cartridge?

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Old 09-15-2018, 11:17 PM   #3 (permalink)
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But if the wire was broken, I shouldn't have continuity, right?
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Old 09-15-2018, 11:36 PM   #4 (permalink)
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I wasn't sure if you had checked the wiring too.

Does the voltage drop once the load of the heater is added to the circuit?

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Old 09-15-2018, 11:41 PM   #5 (permalink)
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I didn't think to check that, but will look in the morning. I've got a guy on Facebook who is saying it sounds like the onboard MOSFET failed.

If that's the case, I should be able to just change my firmware to use the E1 terminal for the primary extruder (I only use a single extrusion setup anyway) to get it working. I'll probably want to order a new board, in case the problem spreads.
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Old 09-16-2018, 01:09 AM   #6 (permalink)
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If the MOSFET had failed, wouldn't you have no output voltage when the board calls for the heater to come on?

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Old 09-17-2018, 09:21 AM   #7 (permalink)
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I didn't get to hook it up, because my neighbor's dog jumped the fence and attacked my dog, but the new heater cartridge has a resistance of only 3.4 ohms. Based on that, I think my heater failed. Hopefully, I'll have the new hotend wired up tonight and be back at work.
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Old 09-17-2018, 10:34 AM   #8 (permalink)
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Yeah, sorry for the late reply, but any resistance in mega-ohms is too high for a heater on most anything.

Any continuity is probably from insulation with carbon or corrosion on it.
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Old 09-17-2018, 10:58 AM   #9 (permalink)
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I wanted to get the new all metal hotend wired up yesterday, but life had other plans. In the meantime, I'm still struggling to find a good part fan solution. Thingiverse is full of options, but most of them end up cutting 40+mm off my print area, and I'm not really okay with that. Looks like I'll be doing more part design work before I get into paintball projects.
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